C246 A Hard-won Kiss
Basically, other than Huo Zijin and them, no one else knew about the existence of this house. Therefore, it was very strange to hear someone knocking on the door at this time of day.
If it was someone who wanted to ambush them, they wouldn't have knocked on the door in the middle of the night to attract their attention. But for this reason, they couldn't think of any other reason